(CBS/AP) JACKSON, Miss. - Authorities say they've broken up a major dogfighting ring after a raid in Mississippi snagged people from around the country as part of a monthslong, nationwide investigation.

David Murphy is an investigator with the Benton County Sheriff's Office in north Mississippi. He says at least 200 people were at the dogfighting Saturday night when state and federal officers raided a barn there.

Murphy said Monday that nearly 50 people were arrested and authorities are looking for others who fled, many leaving behind their vehicles. At least 70 vehicles were seized.

He says shots were fired when officers arrived but nobody was hurt and authorities didn't return fire. About 20 dogs were rescued.